News: Research Highlight

Polymer conducting, semiconducting, and charge storing devices

February 10, 2021

Polymer conducting, semiconducting, and charge storing devices; self-assembled and chemically responsive electronic materials, energy-converting materials N-type organic materials are essential for developing practical organic thermoelectric (TE) devices.  Two n-type polymers based on dichlorodithienylethene (ClTVT) were synthesized. Using the two polymers doped with CoCp2 and N-DMBI, respectively, organic thermoelectric devices were prepared and compared. Doping of […]

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Conductive p-type polymers

February 1, 2021

Enhanced Molecular Doping for High Conductivity in Polymers with Volume Freed for Dopants We present two new polythiophene isomers, with more separation and lower side chain density on the backbone compared with the typical polythiophenes. The introduction of spacer subunits to separate the side chains improves the accommodation of dopant molecules close to the polymer […]

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Fluorene sensory polymer

February 1, 2021

The development of high-performance conjugated polymer-based gas sensors involves detailed structural tailoring such that high sensitivities are achieved without compromising the stability of the fabricated devices. In this work, we systematically developed a series of diketopyrrolopyrrole (DPP)-based polymer semiconductors by modifying the polymer backbone to achieve and rationalize enhancements in gas sensitivities and electronic stability […]

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Highly conductive polymers

February 1, 2021

Polymer conducting, semiconducting, and charge storing devices; self-assembled and chemically responsive electronic materials, energy-converting materials Thermoelectric efficiency is proportional to electrical conductivity of a material and the square of the Seebeck coefficient, the voltage obtained per unit temperature difference.  Increasing the Seebeck coefficient has the effect of decreasing the number of mobile charge carriers, lowering […]

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“Deformation-Driven Dynamic Precipitation in Mg-Al alloys” by Suhas Eswarappa Prameela wins “Best Poster Award” at the 2019 Mach Conference

April 16, 2019

Suhas Eswarappa Prameela was awarded the best poster award at this years 2019 Mach Conference in Annapolis Maryland. Suhas’s research in Tim Weihs’ lab is focused on developing better lightweight armor materials for the US Army. Conventional heat treatment of Magnesium alloys causes long, thin intermetallic particles to precipitate throughout the alloy. These particles are […]

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Crystals

Johns Hopkins engineers develop tool to quickly calculate crystal properties

April 15, 2016

Look closely enough and you’ll find crystals in a number of technologies and devices, including batteries, medical implants, and semiconductors. Understanding the properties of crystalline materials is vital to continued advancement, but often the amount of time and money needed to analyze these properties can have a negative impact on new developments.

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